I was first contacted by a sourcer for a different position, but the recruiter that she connected me to never replied my email. A few months passed, I received an offer from another company so I thought I'd check in with the recruiter again. He emailed back, but ultimately the position he was recruiting for wasn't a good fit. He passed me to a second recruiter, who's super efficient in terms of both scheduling and getting back to me with the results. It took him literally less than 24 hours from the beginning of my interview to get me a verbal offer. Super impressive. For the onsite, there were 5 back-to-back 30-min interviews. It was quite intense, and a lot of talking. They should've fit a 5 min break here and there, but oh well. There's a few algorithm questions, stats, design, research background, etc.